Nowadays, many frameworks are good enough to fulfill whatever needs you want to have in web development. It totally relies on which environment you feel more suitable. So whatever you prefer to use it is really matter of that you enjoy most when using.

both frameworks is so good that the differences are almost negligible and are highly dependent on the context. Some permutation of different framework components and browser environments might have a trivial performance gap. In other words, the important differences revolve around features that support designers and developers.

Even with the differences I highlighted in mind, I don’t think either framework has a massive advantage. However, I personally prefer using Foundation because of its slightly more robust grid system. When I design new web projects, I always start by thinking about the mobile experience before I move on to larger screen sizes, and I personally feel like Foundation has a slight edge with block grids and collapsible rows. However, I do still enjoy using Bootstrap when I just need a quick site without much customization, because I find that Bootstrap is easier to theme.

You can know much more about this by reading these articles which shows clear cut differences of both the framework:

I really enjoy using Foundation. The mobile first development strategy is a great way to develop for the future and the grid system is a very quick and efficient way to get started on a project. On the other hand Bootstrap has been around for awhile and the user community is quite large. It you want to just get started and develop for today, go for Bootstrap. If you want to develop for the future, learn Foundation. Either way it will be a great journey. Good luck!

Can someone tell the real differences between Bootstrap and Foundation? I work with bootstrap for a while, but now I saw the new tutorial series for Foundation. So I don't know if it's better to stay with bootstrap, or not.